239 lines
7.4 KiB
C
239 lines
7.4 KiB
C
/** @file
|
|
*/
|
|
|
|
#ifndef __LWIP_DHCP_H__
|
|
#define __LWIP_DHCP_H__
|
|
|
|
#include "lwip/opt.h"
|
|
|
|
#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
|
|
|
|
#include "lwip/netif.h"
|
|
#include "lwip/udp.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** period (in seconds) of the application calling dhcp_coarse_tmr() */
|
|
#define DHCP_COARSE_TIMER_SECS 60
|
|
/** period (in milliseconds) of the application calling dhcp_coarse_tmr() */
|
|
#define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS * 1000UL)
|
|
/** period (in milliseconds) of the application calling dhcp_fine_tmr() */
|
|
#define DHCP_FINE_TIMER_MSECS 500
|
|
|
|
#define DHCP_CHADDR_LEN 16U
|
|
#define DHCP_SNAME_LEN 64U
|
|
#define DHCP_FILE_LEN 128U
|
|
|
|
struct dhcp
|
|
{
|
|
/** transaction identifier of last sent request */
|
|
u32_t xid;
|
|
/** our connection to the DHCP server */
|
|
struct udp_pcb *pcb;
|
|
/** incoming msg */
|
|
struct dhcp_msg *msg_in;
|
|
/** current DHCP state machine state */
|
|
u8_t state;
|
|
/** retries of current request */
|
|
u8_t tries;
|
|
#if LWIP_DHCP_AUTOIP_COOP
|
|
u8_t autoip_coop_state;
|
|
#endif
|
|
u8_t subnet_mask_given;
|
|
|
|
struct pbuf *p_out; /* pbuf of outcoming msg */
|
|
struct dhcp_msg *msg_out; /* outgoing msg */
|
|
u16_t options_out_len; /* outgoing msg options length */
|
|
u16_t request_timeout; /* #ticks with period DHCP_FINE_TIMER_SECS for request timeout */
|
|
u16_t t1_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for renewal time */
|
|
u16_t t2_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for rebind time */
|
|
ip_addr_t server_ip_addr; /* dhcp server address that offered this lease */
|
|
ip_addr_t offered_ip_addr;
|
|
ip_addr_t offered_sn_mask;
|
|
ip_addr_t offered_gw_addr;
|
|
|
|
u32_t offered_t0_lease; /* lease period (in seconds) */
|
|
u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
|
|
u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period) */
|
|
/* @todo: LWIP_DHCP_BOOTP_FILE configuration option?
|
|
integrate with possible TFTP-client for booting? */
|
|
#if LWIP_DHCP_BOOTP_FILE
|
|
ip_addr_t offered_si_addr;
|
|
char boot_file_name[DHCP_FILE_LEN];
|
|
#endif /* LWIP_DHCP_BOOTPFILE */
|
|
};
|
|
|
|
/* MUST be compiled with "pack structs" or equivalent! */
|
|
#ifdef PACK_STRUCT_USE_INCLUDES
|
|
# include "arch/bpstruct.h"
|
|
#endif
|
|
PACK_STRUCT_BEGIN
|
|
/** minimum set of fields of any DHCP message */
|
|
struct dhcp_msg
|
|
{
|
|
PACK_STRUCT_FIELD(u8_t op);
|
|
PACK_STRUCT_FIELD(u8_t htype);
|
|
PACK_STRUCT_FIELD(u8_t hlen);
|
|
PACK_STRUCT_FIELD(u8_t hops);
|
|
PACK_STRUCT_FIELD(u32_t xid);
|
|
PACK_STRUCT_FIELD(u16_t secs);
|
|
PACK_STRUCT_FIELD(u16_t flags);
|
|
PACK_STRUCT_FIELD(ip_addr_p_t ciaddr);
|
|
PACK_STRUCT_FIELD(ip_addr_p_t yiaddr);
|
|
PACK_STRUCT_FIELD(ip_addr_p_t siaddr);
|
|
PACK_STRUCT_FIELD(ip_addr_p_t giaddr);
|
|
PACK_STRUCT_FIELD(u8_t chaddr[DHCP_CHADDR_LEN]);
|
|
PACK_STRUCT_FIELD(u8_t sname[DHCP_SNAME_LEN]);
|
|
PACK_STRUCT_FIELD(u8_t file[DHCP_FILE_LEN]);
|
|
PACK_STRUCT_FIELD(u32_t cookie);
|
|
#define DHCP_MIN_OPTIONS_LEN 68U
|
|
/** make sure user does not configure this too small */
|
|
#if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
|
|
# undef DHCP_OPTIONS_LEN
|
|
#endif
|
|
/** allow this to be configured in lwipopts.h, but not too small */
|
|
#if (!defined(DHCP_OPTIONS_LEN))
|
|
/** set this to be sufficient for your options in outgoing DHCP msgs */
|
|
# define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
|
|
#endif
|
|
PACK_STRUCT_FIELD(u8_t options[DHCP_OPTIONS_LEN]);
|
|
} PACK_STRUCT_STRUCT;
|
|
PACK_STRUCT_END
|
|
#ifdef PACK_STRUCT_USE_INCLUDES
|
|
# include "arch/epstruct.h"
|
|
#endif
|
|
|
|
void dhcp_set_struct(struct netif *netif, struct dhcp *dhcp);
|
|
/** start DHCP configuration */
|
|
err_t dhcp_start(struct netif *netif);
|
|
/** enforce early lease renewal (not needed normally)*/
|
|
err_t dhcp_renew(struct netif *netif);
|
|
/** release the DHCP lease, usually called before dhcp_stop()*/
|
|
err_t dhcp_release(struct netif *netif);
|
|
/** stop DHCP configuration */
|
|
void dhcp_stop(struct netif *netif);
|
|
/** inform server of our manual IP address */
|
|
void dhcp_inform(struct netif *netif);
|
|
/** Handle a possible change in the network configuration */
|
|
void dhcp_network_changed(struct netif *netif);
|
|
|
|
/** if enabled, check whether the offered IP address is not in use, using ARP */
|
|
#if DHCP_DOES_ARP_CHECK
|
|
void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr);
|
|
#endif
|
|
|
|
/** to be called every minute */
|
|
void dhcp_coarse_tmr(void);
|
|
/** to be called every half second */
|
|
void dhcp_fine_tmr(void);
|
|
|
|
/** DHCP message item offsets and length */
|
|
#define DHCP_OP_OFS 0
|
|
#define DHCP_HTYPE_OFS 1
|
|
#define DHCP_HLEN_OFS 2
|
|
#define DHCP_HOPS_OFS 3
|
|
#define DHCP_XID_OFS 4
|
|
#define DHCP_SECS_OFS 8
|
|
#define DHCP_FLAGS_OFS 10
|
|
#define DHCP_CIADDR_OFS 12
|
|
#define DHCP_YIADDR_OFS 16
|
|
#define DHCP_SIADDR_OFS 20
|
|
#define DHCP_GIADDR_OFS 24
|
|
#define DHCP_CHADDR_OFS 28
|
|
#define DHCP_SNAME_OFS 44
|
|
#define DHCP_FILE_OFS 108
|
|
#define DHCP_MSG_LEN 236
|
|
|
|
#define DHCP_COOKIE_OFS DHCP_MSG_LEN
|
|
#define DHCP_OPTIONS_OFS (DHCP_MSG_LEN + 4)
|
|
|
|
#define DHCP_CLIENT_PORT 68
|
|
#define DHCP_SERVER_PORT 67
|
|
|
|
/** DHCP client states */
|
|
#define DHCP_OFF 0
|
|
#define DHCP_REQUESTING 1
|
|
#define DHCP_INIT 2
|
|
#define DHCP_REBOOTING 3
|
|
#define DHCP_REBINDING 4
|
|
#define DHCP_RENEWING 5
|
|
#define DHCP_SELECTING 6
|
|
#define DHCP_INFORMING 7
|
|
#define DHCP_CHECKING 8
|
|
#define DHCP_PERMANENT 9
|
|
#define DHCP_BOUND 10
|
|
/** not yet implemented #define DHCP_RELEASING 11 */
|
|
#define DHCP_BACKING_OFF 12
|
|
|
|
/** AUTOIP cooperatation flags */
|
|
#define DHCP_AUTOIP_COOP_STATE_OFF 0
|
|
#define DHCP_AUTOIP_COOP_STATE_ON 1
|
|
|
|
#define DHCP_BOOTREQUEST 1
|
|
#define DHCP_BOOTREPLY 2
|
|
|
|
/** DHCP message types */
|
|
#define DHCP_DISCOVER 1
|
|
#define DHCP_OFFER 2
|
|
#define DHCP_REQUEST 3
|
|
#define DHCP_DECLINE 4
|
|
#define DHCP_ACK 5
|
|
#define DHCP_NAK 6
|
|
#define DHCP_RELEASE 7
|
|
#define DHCP_INFORM 8
|
|
|
|
/** DHCP hardware type, currently only ethernet is supported */
|
|
#define DHCP_HTYPE_ETH 1
|
|
|
|
#define DHCP_MAGIC_COOKIE 0x63825363UL
|
|
|
|
/* This is a list of options for BOOTP and DHCP, see RFC 2132 for descriptions */
|
|
|
|
/** BootP options */
|
|
#define DHCP_OPTION_PAD 0
|
|
#define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */
|
|
#define DHCP_OPTION_ROUTER 3
|
|
#define DHCP_OPTION_DNS_SERVER 6
|
|
#define DHCP_OPTION_HOSTNAME 12
|
|
#define DHCP_OPTION_IP_TTL 23
|
|
#define DHCP_OPTION_MTU 26
|
|
#define DHCP_OPTION_BROADCAST 28
|
|
#define DHCP_OPTION_TCP_TTL 37
|
|
#define DHCP_OPTION_END 255
|
|
|
|
/** DHCP options */
|
|
#define DHCP_OPTION_REQUESTED_IP 50 /* RFC 2132 9.1, requested IP address */
|
|
#define DHCP_OPTION_LEASE_TIME 51 /* RFC 2132 9.2, time in seconds, in 4 bytes */
|
|
#define DHCP_OPTION_OVERLOAD 52 /* RFC2132 9.3, use file and/or sname field for options */
|
|
|
|
#define DHCP_OPTION_MESSAGE_TYPE 53 /* RFC 2132 9.6, important for DHCP */
|
|
#define DHCP_OPTION_MESSAGE_TYPE_LEN 1
|
|
|
|
#define DHCP_OPTION_SERVER_ID 54 /* RFC 2132 9.7, server IP address */
|
|
#define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */
|
|
|
|
#define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 9.10, message size accepted >= 576 */
|
|
#define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
|
|
|
|
#define DHCP_OPTION_T1 58 /* T1 renewal time */
|
|
#define DHCP_OPTION_T2 59 /* T2 rebinding time */
|
|
#define DHCP_OPTION_US 60
|
|
#define DHCP_OPTION_CLIENT_ID 61
|
|
#define DHCP_OPTION_TFTP_SERVERNAME 66
|
|
#define DHCP_OPTION_BOOTFILE 67
|
|
|
|
/** possible combinations of overloading the file and sname fields with options */
|
|
#define DHCP_OVERLOAD_NONE 0
|
|
#define DHCP_OVERLOAD_FILE 1
|
|
#define DHCP_OVERLOAD_SNAME 2
|
|
#define DHCP_OVERLOAD_SNAME_FILE 3
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LWIP_DHCP */
|
|
|
|
#endif /*__LWIP_DHCP_H__*/
|